Colour − colour diagram (Y−K vs. J−K) for the stars from a combined UKIDSS/2MASS catalogue (top panel) and for the 2MASS stars of the MRC 1017-220 field (bottom panel), shown as an example for the calibration of the Y-band HAWK-I data. Stars are well fitted by an empirical colour − colour relation, (Y−K)Vega = 1.45 × (J−K)Vega (solid line). The standard deviation (0.07) of the distribution is shown by the dotted lines.
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